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-rw-r--r--net/sunrpc/auth_gss/gss_mech_switch.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_mech_switch.c b/net/sunrpc/auth_gss/gss_mech_switch.c
new file mode 100644
index 000000000000..9dfb68377d69
--- /dev/null
+++ b/net/sunrpc/auth_gss/gss_mech_switch.c
@@ -0,0 +1,301 @@
+/*
+ * linux/net/sunrpc/gss_mech_switch.c
+ *
+ * Copyright (c) 2001 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * J. Bruce Fields <bfields@umich.edu>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/socket.h>
+#include <linux/module.h>
+#include <linux/sunrpc/msg_prot.h>
+#include <linux/sunrpc/gss_asn1.h>
+#include <linux/sunrpc/auth_gss.h>
+#include <linux/sunrpc/svcauth_gss.h>
+#include <linux/sunrpc/gss_err.h>
+#include <linux/sunrpc/sched.h>
+#include <linux/sunrpc/gss_api.h>
+#include <linux/sunrpc/clnt.h>
+
+#ifdef RPC_DEBUG
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+static LIST_HEAD(registered_mechs);
+static DEFINE_SPINLOCK(registered_mechs_lock);
+
+static void
+gss_mech_free(struct gss_api_mech *gm)
+{
+ struct pf_desc *pf;
+ int i;
+
+ for (i = 0; i < gm->gm_pf_num; i++) {
+ pf = &gm->gm_pfs[i];
+ if (pf->auth_domain_name)
+ kfree(pf->auth_domain_name);
+ pf->auth_domain_name = NULL;
+ }
+}
+
+static inline char *
+make_auth_domain_name(char *name)
+{
+ static char *prefix = "gss/";
+ char *new;
+
+ new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
+ if (new) {
+ strcpy(new, prefix);
+ strcat(new, name);
+ }
+ return new;
+}
+
+static int
+gss_mech_svc_setup(struct gss_api_mech *gm)
+{
+ struct pf_desc *pf;
+ int i, status;
+
+ for (i = 0; i < gm->gm_pf_num; i++) {
+ pf = &gm->gm_pfs[i];
+ pf->auth_domain_name = make_auth_domain_name(pf->name);
+ status = -ENOMEM;
+ if (pf->auth_domain_name == NULL)
+ goto out;
+ status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
+ pf->auth_domain_name);
+ if (status)
+ goto out;
+ }
+ return 0;
+out:
+ gss_mech_free(gm);
+ return status;
+}
+
+int
+gss_mech_register(struct gss_api_mech *gm)
+{
+ int status;
+
+ status = gss_mech_svc_setup(gm);
+ if (status)
+ return status;
+ spin_lock(&registered_mechs_lock);
+ list_add(&gm->gm_list, &registered_mechs);
+ spin_unlock(&registered_mechs_lock);
+ dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
+ return 0;
+}
+
+EXPORT_SYMBOL(gss_mech_register);
+
+void
+gss_mech_unregister(struct gss_api_mech *gm)
+{
+ spin_lock(&registered_mechs_lock);
+ list_del(&gm->gm_list);
+ spin_unlock(&registered_mechs_lock);
+ dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
+ gss_mech_free(gm);
+}
+
+EXPORT_SYMBOL(gss_mech_unregister);
+
+struct gss_api_mech *
+gss_mech_get(struct gss_api_mech *gm)
+{
+ __module_get(gm->gm_owner);
+ return gm;
+}
+
+EXPORT_SYMBOL(gss_mech_get);
+
+struct gss_api_mech *
+gss_mech_get_by_name(const char *name)
+{
+ struct gss_api_mech *pos, *gm = NULL;
+
+ spin_lock(&registered_mechs_lock);
+ list_for_each_entry(pos, &registered_mechs, gm_list) {
+ if (0 == strcmp(name, pos->gm_name)) {
+ if (try_module_get(pos->gm_owner))
+ gm = pos;
+ break;
+ }
+ }
+ spin_unlock(&registered_mechs_lock);
+ return gm;
+
+}
+
+EXPORT_SYMBOL(gss_mech_get_by_name);
+
+static inline int
+mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
+{
+ int i;
+
+ for (i = 0; i < gm->gm_pf_num; i++) {
+ if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
+ return 1;
+ }
+ return 0;
+}
+
+struct gss_api_mech *
+gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
+{
+ struct gss_api_mech *pos, *gm = NULL;
+
+ spin_lock(&registered_mechs_lock);
+ list_for_each_entry(pos, &registered_mechs, gm_list) {
+ if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
+ module_put(pos->gm_owner);
+ continue;
+ }
+ if (try_module_get(pos->gm_owner))
+ gm = pos;
+ break;
+ }
+ spin_unlock(&registered_mechs_lock);
+ return gm;
+}
+
+EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
+
+u32
+gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
+{
+ int i;
+
+ for (i = 0; i < gm->gm_pf_num; i++) {
+ if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
+ return gm->gm_pfs[i].service;
+ }
+ return 0;
+}
+
+EXPORT_SYMBOL(gss_pseudoflavor_to_service);
+
+char *
+gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
+{
+ int i;
+
+ for (i = 0; i < gm->gm_pf_num; i++) {
+ if (gm->gm_pfs[i].service == service)
+ return gm->gm_pfs[i].auth_domain_name;
+ }
+ return NULL;
+}
+
+EXPORT_SYMBOL(gss_service_to_auth_domain_name);
+
+void
+gss_mech_put(struct gss_api_mech * gm)
+{
+ module_put(gm->gm_owner);
+}
+
+EXPORT_SYMBOL(gss_mech_put);
+
+/* The mech could probably be determined from the token instead, but it's just
+ * as easy for now to pass it in. */
+int
+gss_import_sec_context(const void *input_token, size_t bufsize,
+ struct gss_api_mech *mech,
+ struct gss_ctx **ctx_id)
+{
+ if (!(*ctx_id = kmalloc(sizeof(**ctx_id), GFP_KERNEL)))
+ return GSS_S_FAILURE;
+ memset(*ctx_id, 0, sizeof(**ctx_id));
+ (*ctx_id)->mech_type = gss_mech_get(mech);
+
+ return mech->gm_ops
+ ->gss_import_sec_context(input_token, bufsize, *ctx_id);
+}
+
+/* gss_get_mic: compute a mic over message and return mic_token. */
+
+u32
+gss_get_mic(struct gss_ctx *context_handle,
+ u32 qop,
+ struct xdr_buf *message,
+ struct xdr_netobj *mic_token)
+{
+ return context_handle->mech_type->gm_ops
+ ->gss_get_mic(context_handle,
+ qop,
+ message,
+ mic_token);
+}
+
+/* gss_verify_mic: check whether the provided mic_token verifies message. */
+
+u32
+gss_verify_mic(struct gss_ctx *context_handle,
+ struct xdr_buf *message,
+ struct xdr_netobj *mic_token,
+ u32 *qstate)
+{
+ return context_handle->mech_type->gm_ops
+ ->gss_verify_mic(context_handle,
+ message,
+ mic_token,
+ qstate);
+}
+
+/* gss_delete_sec_context: free all resources associated with context_handle.
+ * Note this differs from the RFC 2744-specified prototype in that we don't
+ * bother returning an output token, since it would never be used anyway. */
+
+u32
+gss_delete_sec_context(struct gss_ctx **context_handle)
+{
+ dprintk("RPC: gss_delete_sec_context deleting %p\n",
+ *context_handle);
+
+ if (!*context_handle)
+ return(GSS_S_NO_CONTEXT);
+ if ((*context_handle)->internal_ctx_id != 0)
+ (*context_handle)->mech_type->gm_ops
+ ->gss_delete_sec_context((*context_handle)
+ ->internal_ctx_id);
+ if ((*context_handle)->mech_type)
+ gss_mech_put((*context_handle)->mech_type);
+ kfree(*context_handle);
+ *context_handle=NULL;
+ return GSS_S_COMPLETE;
+}